Chandra X-Ray Observatory
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Last modified: 13 March 2017

SIM: Science Instrument Module


The ACIS and HRC focal plane instruments are both attached to a single sliding stage, the Science Instrument Module (SIM). The SIM slides in the spacecraft Z-axis to move one of the flight instruments into the mirror (HRMA) focus, and has a focus adjustment in the spacecraft X-axis. The SIM also carries the fiducial lights use in the aspect system.

See the Proposers' Observatory Guide for technical details.



Last modified: 13 March 2017
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The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory. 60 Garden Street, Cambridge, MA 02138 USA.   Email:   cxchelp@head.cfa.harvard.edu Smithsonian Institution, Copyright © 1998-2017. All rights reserved.